Two stars each of one solar mass `(= 2 x× 10^(30) kg) `are approaching each other for a head on collision. When they are a distance `10^(9)` km, their speeds are negligible. What is the speed with which they collide ? The radius of each star is `10^(4)` km. Assume the stars to remain undistorted until they collide. (Use the known value of G).

Explanation

`2.6 xx 10^(6)` m/s